Lancer Tactical
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Lancer Tactical's 6.03mm x 290mm aluminum inner barrel is a drop-in upgrade for compact carbines and submachine guns. The 6.03mm bore is slightly tighter than a stock 6.05mm, which gives the BB a more consistent seal as it travels down the barrel. Aluminum keeps the weight low at the front of the gun, and the bore is easy to clean through with a rod and patch. A 290mm barrel sits in the range where a ported cylinder is the better match; pair it with one so it fills the barrel without wasting air. Clean it before fitting to clear any machining residue.